CN113845366A - Preparation method of light refractory material - Google Patents
Preparation method of light refractory material Download PDFInfo
- Publication number
- CN113845366A CN113845366A CN202111436380.XA CN202111436380A CN113845366A CN 113845366 A CN113845366 A CN 113845366A CN 202111436380 A CN202111436380 A CN 202111436380A CN 113845366 A CN113845366 A CN 113845366A
- Authority
- CN
- China
- Prior art keywords
- weight percentage
- refractory material
- percentage content
- powder
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
The invention relates to the technical field of refractory material preparation, and provides a preparation method of a light refractory material, which comprises the following steps: s1, dissolving polyvinyl alcohol in water to prepare a binder solution; s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture; s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable; and S4, pouring the castable into a mold, carrying out vibration molding, demolding and drying to obtain the light refractory material. The invention effectively improves the wettability between the mixture and the solution by dissolving the polyvinyl alcohol in the binding agent solution prepared by water, enhances the workability of the casting material, ensures the drying strength of the light refractory material, reduces the consumption of cement, has the advantages of high compressive strength, no shrinkage cracking, good heat-insulating property and the like, and can be directly used as a working layer to be applied to high-temperature parts in contact with flame.
Description
Technical Field
The invention relates to the technical field of refractory material preparation, in particular to a preparation method of a light refractory material.
Background
In an industrial kiln, in order to reduce the heat accumulation loss and the surface heat dissipation loss of a kiln body, light bricks with low heat conductivity and small heat capacity are usually selected as masonry structure materials, so that the method has the effects of saving fuel consumption, improving the production efficiency of equipment and reducing the weight of the kiln body. However, in the high-temperature industry, the light-weight bricks are difficult to build in special-shaped parts of some kilns, and have the problems of easy shrinkage, multiple brick joints and the like, so that the application of the light-weight bricks is limited.
The light refractory castable is an unshaped refractory material capable of making up the defects, has the advantages of convenient construction and timely application in various kiln projects. The light refractory castable is composed of light refractory aggregate, refractory powder, a bonding agent, an additive and the like, and is cast and molded by adding water or other bonding agent solutions during construction. The heat-insulating lining is generally used for high-temperature industrial furnaces, and can simplify the structure of the furnace, improve the product quality, save energy and improve the labor condition.
The existing lightweight refractory castable still has many problems in practical application, such as low strength, slow hardening, easy shrinkage cracking and the like. Because the binder adopted by the traditional lightweight castable is mainly cement, and the common lightweight aggregate contains a large number of open pores, part of cement and water can enter the pores in the forming process, thereby increasing the consumption of the cement and the addition of the water and reducing the strength of the castable. Too high a cement addition also has an adverse effect on the high temperature strength of the castable. In some industrial kiln applications, binding agents such as water glass and sol can be selected according to requirements of baking, construction and the like, the problems of low hardening speed and long demoulding time are easily caused when the binding agents are selected, and in a high-temperature working environment, materials are often seriously shrunk and cracked due to dehydration or loss of burning, so that great harm is caused to use.
Disclosure of Invention
The invention provides a preparation method of a light refractory material, which is used for solving the defects of low strength and easy shrinkage cracking of the light refractory material caused by large water addition in the prior art, and realizing the improvement of the compressive strength and the heat insulation performance of the light refractory material without shrinkage cracking phenomenon.
The invention provides a preparation method of a light refractory material, which comprises the following steps:
s1, dissolving polyvinyl alcohol in water to prepare a binder solution;
s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture;
s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable;
and S4, pouring the castable into a mold, carrying out vibration molding, demolding and drying to obtain the light refractory material.
According to the preparation method of the light refractory material provided by the invention, the polyvinyl alcohol is polyvinyl alcohol with medium and/or high polymerization degree.
According to the preparation method of the light refractory material provided by the invention, the mass concentration of the binding agent solution is 4-8%.
According to the preparation method of the lightweight refractory material provided by the invention, the aggregate is lightweight mullite, the powder comprises boulder, kyanite powder, Guangxi mud, silicon micro powder and alumina micro powder, and the bonding agent is calcium aluminate cement.
According to the preparation method of the light refractory material provided by the invention, the weight percentage content of each raw material in the mixture is as follows:
60-65% of light mullite, 3-5% of floating beads, 12-15% of kyanite powder, 7-10% of Guangxi mud, 1-3% of silica micropowder, 3-5% of alumina micropowder and 3-5% of calcium aluminate cement.
According to the preparation method of the light refractory material provided by the invention, the aggregate is prepared from light mullite with granularity of 3-12 mm, 1-3 mm and 0-1 mm according to the weight ratio of 6: 3: 4, the weight percentage content of the aluminum oxide in the light mullite is 50-65%, the weight percentage content of the ferric oxide is 1.5-3%, and the weight percentage content of the silicon dioxide is 34-36%.
According to the preparation method of the light refractory material, the particle size of the floating bead is 30-50 meshes, the weight percentage content of aluminum oxide in the floating bead is 27-29%, and the weight percentage content of ferric oxide in the floating bead is 2.8-3.0%;
the granularity of the cyanite powder is 40-100 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 50-56%, and the weight percentage content of ferric oxide in the cyanite powder is 1.0-1.5%;
the particle size of the Guangxi mud is 200-320 meshes, the weight percentage content of aluminum oxide in the Guangxi mud is 30-31%, and the weight percentage content of ferric oxide in the Guangxi mud is 1.0-1.5%;
the silicon dioxide accounts for 80-90 wt% of the silicon micro powder;
the aluminum oxide micro powder contains 99.0-99.9 wt% of aluminum oxide.
According to the preparation method of the lightweight refractory material provided by the invention, the weight percentage content of alumina in the calcium aluminate cement is 68.7-70.5%, and the weight percentage content of calcium oxide in the calcium aluminate cement is 28.5-30.5%.
According to the preparation method of the light refractory material provided by the invention, in the step S1, polyvinyl alcohol is dissolved in water, heated to 70-80 ℃, and stirred to prepare a binder solution.
According to the preparation method of the light refractory material provided by the invention, in the step S4, the drying temperature is 70 ℃, and the drying time is 24 hours.
The preparation method of the light refractory material provided by the invention comprises the following steps: s1, dissolving polyvinyl alcohol in water to prepare a binder solution; s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture; s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable; s4, pouring the castable into a mold, vibration molding, demolding and drying to obtain the light refractory material, dissolving polyvinyl alcohol into a binding agent solution prepared from water to effectively improve the wettability between the mixture and the solution, so that the workability of the castable is enhanced, the drying strength of the light refractory material is ensured, the consumption of cement is reduced, and the light refractory material has the advantages of high compressive strength, no shrinkage cracking, good heat insulation performance and the like, and can be directly used as a working layer to be applied to a high-temperature part in contact with flame.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of the steps of the method for preparing the lightweight refractory material according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The following describes a method for preparing a lightweight refractory of the present invention with reference to fig. 1, including the following steps:
s1, dissolving polyvinyl alcohol in water to prepare a binder solution;
s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture;
s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable;
and S4, pouring the castable into a mold, carrying out vibration molding, demolding and drying to obtain the light refractory material.
According to the preparation method of the light refractory material provided by the invention, the polyvinyl alcohol is polyvinyl alcohol with medium polymerization degree and/or high polymerization degree. The polyvinyl alcohol has the characteristics of easy water solubility, high bonding strength, clean combustion and the like, and the surface tension of the solution is lower than that of water, so that the wettability of the solution and powder is enhanced, the workability of the casting material is enhanced, and no water reducing agent is required to be added additionally. The higher the degree of polymerization of polyvinyl alcohol, the higher the viscosity of the aqueous solution, and the higher the strength after drying, but the solubility in water is lowered. The polymerization degree of polyvinyl alcohol is classified into a low polymerization degree (molecular weight 2.5 to 3.5 ten thousand), a medium polymerization degree (molecular weight 12 to 15 ten thousand), a high polymerization degree (molecular weight 17 to 22 ten thousand), and an ultrahigh polymerization degree (molecular weight 25 to 30 ten thousand), and in order to ensure the fluidity and workability of the material, polyvinyl alcohol having a medium polymerization degree and a high polymerization degree is selected in the present invention.
According to the preparation method of the light refractory material provided by the invention, the mass concentration of the binding agent solution is 4-8%.
According to the preparation method of the lightweight refractory material provided by the invention, the aggregate is lightweight mullite, the powder comprises boulder, kyanite powder, Guangxi mud, silicon micro powder and alumina micro powder, and the bonding agent is calcium aluminate cement.
According to the preparation method of the light refractory material provided by the invention, the weight percentage content of each raw material in the mixture is as follows:
60-65% of light mullite, 3-5% of floating beads, 12-15% of kyanite powder, 7-10% of Guangxi mud, 1-3% of silica micropowder, 3-5% of alumina micropowder and 3-5% of calcium aluminate cement.
According to the preparation method of the light refractory material provided by the invention, the aggregate is prepared from light mullite with granularity of 3-12 mm, 1-3 mm and 0-1 mm according to the weight ratio of 6: 3: 4, the weight percentage content of the aluminum oxide in the light mullite is 50-65%, the weight percentage content of the ferric oxide is 1.5-3%, and the weight percentage content of the silicon dioxide is 34-36%.
According to the preparation method of the light refractory material, the particle size of the floating bead is 30-50 meshes, the weight percentage content of aluminum oxide in the floating bead is 27-29%, and the weight percentage content of ferric oxide in the floating bead is 2.8-3.0%;
the granularity of the cyanite powder is 40-100 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 50-56%, and the weight percentage content of ferric oxide in the cyanite powder is 1.0-1.5%;
the particle size of the Guangxi mud is 200-320 meshes, the weight percentage content of aluminum oxide in the Guangxi mud is 30-31%, and the weight percentage content of ferric oxide in the Guangxi mud is 1.0-1.5%;
the weight percentage of the silicon dioxide in the silicon micro powder is 80-90%;
the aluminum oxide micro powder contains 99.0-99.9 wt% of aluminum oxide.
According to the preparation method of the lightweight refractory material provided by the invention, the weight percentage content of aluminum oxide in the calcium aluminate cement is 68.7-70.5%, and the weight percentage content of calcium oxide in the calcium aluminate cement is 28.5-30.5%.
According to the preparation method of the light refractory material provided by the invention, in step S1, polyvinyl alcohol is dissolved in water, heated to 70-80 ℃, and stirred to prepare a binder solution.
According to the preparation method of the light refractory material provided by the invention, in the step S4, the drying temperature is 70 ℃, and the drying time is 24 hours.
Example 1
The preparation method of the light refractory material provided by the embodiment specifically comprises the following steps:
adding polyvinyl alcohol with the molecular weight of 14.5 ten thousand and the medium polymerization degree into water, and stirring at room temperature; after the polyvinyl alcohol is uniformly dispersed, heating the polyvinyl alcohol at the temperature of 70 ℃, continuously stirring the polyvinyl alcohol until the polyvinyl alcohol is completely dissolved, and cooling the solution to room temperature to prepare a bonding agent solution with the mass concentration of 6%;
adding 65% of light mullite, 5% of floating beads, 15% of kyanite powder, 7% of Guangxi mud, 2% of silicon micropowder, 3% of alumina micropowder and 3% of calcium aluminate cement into a stirrer for dry mixing according to the weight percentage to prepare a uniformly mixed mixture; wherein, the particle size of the floating bead is 30 meshes, the weight percentage content of the aluminum oxide in the floating bead is 27 percent, and the weight percentage content of the ferric oxide in the floating bead is 2.8 percent; the granularity of the cyanite powder is 40 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 50%, and the weight percentage content of ferric oxide in the cyanite powder is 1.0%; the particle size of the Guangxi mud is 200 meshes, the weight percentage content of aluminum oxide in the Guangxi mud is 30%, and the weight percentage content of ferric oxide in the Guangxi mud is 1.0%; the weight percentage of the silicon dioxide in the silicon micro powder is 80 percent; the weight percentage of the aluminum oxide in the aluminum oxide micro powder is 99.0 percent; the weight percentage content of the aluminum oxide in the calcium aluminate cement is 68.7 percent, and the weight percentage content of the calcium oxide in the calcium aluminate cement is 28.5 percent;
adding a binding agent solution with the mass concentration of 6% into a stirring machine which is continuously stirred, wherein the adding amount of the binding agent solution is 28% of the total weight of the mixture, and fully mixing the binding agent solution with the mixture to form a slurry castable which can be constructed;
pouring the casting material into a mould, vibrating for forming, demoulding and drying for 24 hours at 70 ℃.
Example 2
The preparation method of the light refractory material provided by the embodiment specifically comprises the following steps:
adding polyvinyl alcohol with the molecular weight of 20.5 ten thousand and high polymerization degree into water, and stirring at room temperature; after the polyvinyl alcohol is uniformly dispersed, heating the polyvinyl alcohol at 80 ℃, continuously stirring the polyvinyl alcohol until the polyvinyl alcohol is completely dissolved, and cooling the solution to room temperature to prepare a bonding agent solution with the mass concentration of 4%;
adding 62% of light mullite, 3% of floating beads, 12% of kyanite powder, 10% of Guangxi mud, 3% of silica micropowder, 5% of alumina micropowder and 5% of calcium aluminate cement into a stirrer for dry mixing according to the weight percentage to prepare a uniformly mixed mixture; wherein, the particle size of the floating bead is 40 meshes, the weight percentage content of the aluminum oxide in the floating bead is 28 percent, and the weight percentage content of the ferric oxide in the floating bead is 2.9 percent; the granularity of the cyanite powder is 70 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 53 percent, and the weight percentage content of ferric oxide in the cyanite powder is 1.3 percent; the granularity of the Guangxi mud is 260 meshes, the weight percentage content of aluminum oxide in the Guangxi mud is 30.5 percent, and the weight percentage content of ferric oxide in the Guangxi mud is 1.3 percent; the weight percentage of the silicon dioxide in the silicon micro powder is 85 percent; the weight percentage of the aluminum oxide in the aluminum oxide micro powder is 99.5 percent; the weight percentage content of the aluminum oxide in the calcium aluminate cement is 69.6 percent, and the weight percentage content of the calcium oxide in the calcium aluminate cement is 29.5 percent;
adding a binding agent solution with the mass concentration of 4% into a stirring machine which is continuously stirred, wherein the adding amount of the binding agent solution is 23% of the total weight of the mixture, and fully mixing the binding agent solution with the mixture to form a slurry castable which can be constructed;
pouring the casting material into a mould, vibrating for forming, demoulding and drying for 24 hours at 70 ℃.
Example 3
The preparation method of the light refractory material provided by the embodiment specifically comprises the following steps:
adding polyvinyl alcohol with the molecular weight of 14.5 ten thousand and the medium polymerization degree and polyvinyl alcohol with the molecular weight of 20.5 ten thousand and the high polymerization degree into water according to the mass ratio of 3:2, and stirring at room temperature; after the polyvinyl alcohol is uniformly dispersed, heating the mixture, controlling the heating temperature to be 80 ℃, continuously stirring the mixture until the polyvinyl alcohol is completely dissolved, and cooling the solution to room temperature to prepare a bonding agent solution with the mass concentration of 5%;
according to the weight percentage, 64 percent of light mullite, 4 percent of floating bead, 14 percent of kyanite powder, 9 percent of Guangxi mud, 1 percent of silica micropowder, 4 percent of alumina micropowder and 4 percent of calcium aluminate cement are added into a stirrer to be dry-mixed to prepare a uniformly mixed mixture; wherein, the particle size of the floating bead is 50 meshes, the weight percentage content of the aluminum oxide in the floating bead is 29 percent, and the weight percentage content of the ferric oxide in the floating bead is 3.0 percent; the granularity of the cyanite powder is 100 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 56%, and the weight percentage content of ferric oxide in the cyanite powder is 1.5%; the particle size of the Guangxi mud is 320 meshes, the weight percentage content of the alumina in the Guangxi mud is 31 percent, and the weight percentage content of the ferric oxide in the Guangxi mud is 1.5 percent; the weight percentage of the silicon dioxide in the silicon micro powder is 90 percent; the weight percentage of the aluminum oxide in the aluminum oxide micro powder is 99.9 percent; the weight percentage content of the aluminum oxide in the calcium aluminate cement is 70.5 percent, and the weight percentage content of the calcium oxide in the calcium aluminate cement is 30.5 percent;
adding a binding agent solution with the mass concentration of 5% into a stirring machine which is continuously stirred, wherein the adding amount of the binding agent solution is 25% of the total weight of the mixture, and fully mixing the binding agent solution with the mixture to form a slurry castable which can be constructed;
pouring the casting material into a mould, vibrating for forming, demoulding and drying for 24 hours at 70 ℃.
The performance of the lightweight refractory materials prepared in examples 1 to 3 was tested as follows:
as can be seen from the above performance tests, the lightweight refractory material prepared in the above examples has a low bulk density and a high compressive strength after being dried and fired (1300 ℃). According to the test result of the permanent line change rate, the shrinkage rate of the material after high-temperature calcination is very small, and the phenomenon of severe shrinkage cracking is avoided. The light refractory material has small heat conductivity coefficient and good heat insulation effect. The light refractory castable can be applied to working linings of various flame furnaces and used as a heat preservation and insulation layer of high-temperature equipment.
By using the aluminate cement and polyvinyl alcohol composite binder, the problems of overlarge addition amount of aluminate cement and water, low material strength and the like of the traditional light refractory castable are solved, the consumption amount of cement is greatly reduced on the basis of ensuring the drying strength of the material, and the problem of poor material strength caused by overhigh addition amount of water is solved. Especially improves the strength of the light refractory material after drying. After high-temperature burning, the polyvinyl alcohol can be burnt out, the porosity is increased, more pores are formed, the heat insulation effect is enhanced, the material has certain strength after being sintered, and the increased porosity can enable the material to achieve better heat insulation effect. When the material is used for the working lining of a kiln, the purposes of energy conservation and environmental protection can be achieved. The material has small volume density, and the weight of the wall body structure can be reduced by 40-60% after pouring. The porous lightweight aggregate and the specific gradation are adopted to ensure that the material achieves better construction property. The higher service temperature puts higher requirements on the performance of the lightweight refractory castable, and the material prepared by the method has high strength, stable structure and light capacity, and can be directly used as a working layer of a high-temperature kiln.
The preparation method of the light refractory material provided by the invention comprises the following steps: s1, dissolving polyvinyl alcohol in water to prepare a binder solution; s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture; s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable; s4, pouring the castable into a mold, vibrating for molding, demolding and drying to obtain the light refractory material, effectively improving the wettability between the mixture and the solution by dissolving polyvinyl alcohol in a binding agent solution prepared by water, enhancing the workability of the castable, ensuring the drying strength of the light refractory material, reducing the consumption of cement, having the advantages of high compressive strength, no shrinkage cracking, good heat insulation performance and the like, and being directly used as a working layer to be applied to a high-temperature part in contact with flame.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The preparation method of the light refractory material is characterized by comprising the following steps:
s1, dissolving polyvinyl alcohol in water to prepare a binder solution;
s2, stirring and mixing the aggregate, the powder and the binding agent to prepare a mixture;
s3, adding the binder solution into the mixture, and stirring to prepare a slurry castable;
and S4, pouring the castable into a mold, carrying out vibration molding, demolding and drying to obtain the light refractory material.
2. The method for producing a lightweight refractory according to claim 1, wherein the polyvinyl alcohol is a polyvinyl alcohol having a medium degree of polymerization and/or a high degree of polymerization.
3. The method for preparing the light refractory according to claim 1, wherein the mass concentration of the binder solution is 4-8%.
4. The method for preparing the lightweight refractory according to claim 1, wherein the aggregate is lightweight mullite, the powder comprises boulder, kyanite powder, Guangxi mud, silica micropowder and alumina micropowder, and the binder is calcium aluminate cement.
5. The preparation method of the light refractory material according to claim 4, wherein the weight percentage content of each raw material in the mixture is as follows:
60-65% of light mullite, 3-5% of floating beads, 12-15% of kyanite powder, 7-10% of Guangxi mud, 1-3% of silica micropowder, 3-5% of alumina micropowder and 3-5% of calcium aluminate cement.
6. The preparation method of the light refractory material according to claim 4, wherein the aggregate is prepared from light mullite with the granularity of 3 mm-12 mm, 1 mm-3 mm and 0 mm-1 mm according to the weight ratio of 6: 3: 4, the weight percentage content of the aluminum oxide in the light mullite is 50-65%, the weight percentage content of the ferric oxide is 1.5-3%, and the weight percentage content of the silicon dioxide is 34-36%.
7. The preparation method of the light refractory material according to claim 4, wherein the floating beads have a particle size of 30-50 meshes, the floating beads contain 27-29 wt% of aluminum oxide, and the floating beads contain 2.8-3.0 wt% of ferric oxide;
the granularity of the cyanite powder is 40-100 meshes, the weight percentage content of aluminum oxide in the cyanite powder is 50-56%, and the weight percentage content of ferric oxide in the cyanite powder is 1.0-1.5%;
the particle size of the Guangxi mud is 200-320 meshes, the weight percentage content of aluminum oxide in the Guangxi mud is 30-31%, and the weight percentage content of ferric oxide in the Guangxi mud is 1.0-1.5%;
the silicon dioxide accounts for 80-90 wt% of the silicon micro powder;
the aluminum oxide micro powder contains 99.0-99.9 wt% of aluminum oxide.
8. The preparation method of the lightweight refractory material as claimed in claim 4, wherein the weight percentage of the alumina in the calcium aluminate cement is 68.7-70.5%, and the weight percentage of the calcium oxide in the calcium aluminate cement is 28.5-30.5%.
9. The method for preparing a lightweight refractory according to any one of claims 1 to 8, wherein in step S1, a binder solution is prepared by dissolving polyvinyl alcohol in water, heating to 70-80 ℃ and stirring.
10. The method for preparing a lightweight refractory according to any one of claims 1 to 8, wherein the drying temperature is 70 ℃ and the drying time is 24 hours in step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436380.XA CN113845366B (en) | 2021-11-30 | 2021-11-30 | Preparation method of light refractory material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436380.XA CN113845366B (en) | 2021-11-30 | 2021-11-30 | Preparation method of light refractory material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113845366A true CN113845366A (en) | 2021-12-28 |
| CN113845366B CN113845366B (en) | 2022-03-15 |
Family
ID=78982283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111436380.XA Active CN113845366B (en) | 2021-11-30 | 2021-11-30 | Preparation method of light refractory material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113845366B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846891A (en) * | 1997-06-10 | 1998-12-08 | Korea Institute Of Science And Technology | Thermal shock-resistant alumina-mullite composite material and preparation method thereof |
| KR20050064558A (en) * | 2003-12-24 | 2005-06-29 | 주식회사 포스렉 | Castable for cement rotary kiln |
| CN101062866A (en) * | 2007-04-17 | 2007-10-31 | 上海彭浦特种耐火材料厂 | Low-density thermostable high-alumina lightening casting material |
| CN103539472A (en) * | 2013-11-09 | 2014-01-29 | 宁夏天纵泓光余热发电技术有限公司 | Light thermal insulation refractory castable |
| CN103864403A (en) * | 2014-04-03 | 2014-06-18 | 武汉科技大学 | Mullite light heat-insulation brick based on kyanite tailings and manufacturing method of brick |
| CN110330347A (en) * | 2019-07-26 | 2019-10-15 | 莱芜市荣华耐火材料有限公司 | Ferronickel rotary kiln high-temperature region kiln lining material and its production technology |
-
2021
- 2021-11-30 CN CN202111436380.XA patent/CN113845366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846891A (en) * | 1997-06-10 | 1998-12-08 | Korea Institute Of Science And Technology | Thermal shock-resistant alumina-mullite composite material and preparation method thereof |
| KR20050064558A (en) * | 2003-12-24 | 2005-06-29 | 주식회사 포스렉 | Castable for cement rotary kiln |
| CN101062866A (en) * | 2007-04-17 | 2007-10-31 | 上海彭浦特种耐火材料厂 | Low-density thermostable high-alumina lightening casting material |
| CN103539472A (en) * | 2013-11-09 | 2014-01-29 | 宁夏天纵泓光余热发电技术有限公司 | Light thermal insulation refractory castable |
| CN103864403A (en) * | 2014-04-03 | 2014-06-18 | 武汉科技大学 | Mullite light heat-insulation brick based on kyanite tailings and manufacturing method of brick |
| CN110330347A (en) * | 2019-07-26 | 2019-10-15 | 莱芜市荣华耐火材料有限公司 | Ferronickel rotary kiln high-temperature region kiln lining material and its production technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113845366B (en) | 2022-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3392226B1 (en) | Magnesium aluminum spinel brick preparation method and magnesium aluminum spinel brick prepared using same | |
| CN101328073B (en) | Self-reinforcing type ceramic fibre pouring material and preparation thereof | |
| CN111153707B (en) | Composite refractory prefabricated part for cylindrical kiln and preparation method thereof | |
| CN105130468B (en) | A kind of flame-proof thermal insulation material and preparation method thereof | |
| CN110483028A (en) | Foundry ladle burning-free mullite silicon carbide brick and preparation method thereof | |
| CN107892581B (en) | High-strength corrosion-resistant zirconia corundum honeycomb ceramic body and preparation method thereof | |
| CN106518043A (en) | Preparing method of low-cost Al-Ca-Si tin bath bottom block | |
| CN112079643A (en) | Refractory castable for coal-fired boiler and preparation method thereof | |
| CN113845366B (en) | Preparation method of light refractory material | |
| CN110204322A (en) | A kind of mullite insulating fire brick and preparation method thereof | |
| WO2023109174A1 (en) | Fiber-reinforced silicious module and preparation method | |
| CN114804823A (en) | Heat-insulating refractory material for air supply device of iron-making blast furnace | |
| CN107266087A (en) | Energy-saving long-life molten iron chute and manufacturing method thereof | |
| CN208846432U (en) | A kind of incinerator insulating layer refractory lining structure | |
| CN111792939A (en) | High-aluminum brick and preparation method thereof | |
| CN111704473A (en) | Heat-preservation refractory castable and preparation method, pouring method and application thereof | |
| CN113200742A (en) | Heat-insulating composite wear-resistant brick | |
| CN112344746A (en) | Sandwich type coke oven door prefabricated part and preparation method thereof | |
| CN115093205B (en) | Refractory material for cement rotary kiln mouth | |
| CN110642610A (en) | Refractory brick for steel receiving opening of tundish and preparation method thereof | |
| CN115849952B (en) | Calcium hexaluminate-sialon light brick and preparation process thereof | |
| CN110540433B (en) | Castable for integral brick cup of coke oven coal charging port and preparation and use methods thereof | |
| CN112919890B (en) | Light mullite-alumina hollow sphere-aluminum titanate sagger and preparation method and application thereof | |
| CN115849924B (en) | Anorthite-sialon light brick and preparation process thereof | |
| JP2013139368A (en) | Method for manufacturing lightweight alumina insulating firebrick |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |